Prefabricated modular buildings are extensively used for skid packages in both upstream and downstream oil and gas facilities.
A typical skid package may incorporate process vessels, compressors, pumps manifolds and other miscellaneous equipment handling flammable materials.
In most cases, the interiors of such buildings are classified as Class I hazardous locations in accordance with Articles 500/505 of NFPA 70 (National Electrical Code) or Section 18 of the CEC (Canadian Electrical Code).
Once a process module has been classified as a hazardous location, the certification of electrical equipment and the wiring methods are impacted. Switchgear, motor control centres and process control equipment are typically designed for installation in an unclassified location.
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